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我在将 Rgraph 与 PHP 和 MySQL 数据集成时遇到问题。我按照 Rgraph 网站的说明进行操作。

在 Rgraph 站点上,该示例使用数组数据,但我的案例不使用数组。我想显示一个月有多少pegawai参加。

<?php
$query2 = "SELECT count(id_absensi) AS jumhadir FROM absensi WHERE nip_pegawai = '123040269'";
if($query2){
    $data = array();

    while ($row = mysql_fetch_assoc($query2)){
        $data[] = $row["jumhadir"];
    }

    $data_string = "[".join(",", $data)."]";
} else {
    print('MySQL query failed with error : '.mysql_error());
}

?>
<html>
<head>

    <!-- Don't forget to update these paths -->

    <script src="libraries/RGraph.common.core.js" ></script>
    <script src="libraries/RGraph.line.js" ></script>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="js/jquery-1.11.3.min.js"></script>

</head>
<body>

    <canvas id="cvs" width="600" height="250">[No canvas support]</canvas>
    <script>
        chart = new RGraph.Line({
            id: 'cvs',
            data: <?php print($data_string) ?>,
            options: {
                gutterLeft: 35,
                gutterRight: 5,
                hmargin: 10,
                tickmarks: 'endcircle',
                labels: <?php print("Kehadiran") ?>
            }
        }.draw()
    </script>

</body>
</html>'

我没有收到任何错误,也没有图表。我错过了什么?

4

1 回答 1

1

这个:

$query2 = "SELECT count(id_absensi) AS jumhadir FROM absensi WHERE nip_pegawai = '123040269'";

不运行查询 - 它只是一个包含 SQL 语句的字符串。因此,您可以尝试将其更改为:

$sql = "SELECT count(id_absensi) AS jumhadir FROM absensi WHERE nip_pegawai = '123040269'";
$query2 = mysql_query($sql);

if ($query2) {
    // ...

当然,在您进行查询之前,您必须连接到您的数据库:

$connection = mysql_connect('localhost', 'username', 'password');
mysql_select_db('myDatabase');
于 2015-12-01T12:01:13.603 回答